Using Kerberos with Cloudera Search

You can use Kerberos authentication with clients such as curl. To use curl, begin by acquiring valid Kerberos credentials and then run the desired command. For example, you might use commands similar to the following:

kinit jdoe@EXAMPLE.COM

curl --negotiate -u foo:bar http://solrserver:8983/solr/

curl --negotiate -u : http://solrserver:8983/solr/

If you are using solrctl to manage your deployment in an environment that requires Kerberos authentication, you must have valid Kerberos credentials, which you can obtain using the kinit command. For example:

kinit jdoe@EXAMPLE.COM

For more information about solrctl, see solrctl Reference.

Some applications, such as those using the SolrJ library, require a Java Authentication and Authorization Service (JAAS) configuration file. You can use a file name other than jaas.conf.

Creating a JAAS configuration file:

• If you are authenticating using kinit to obtain credentials, you can configure the client to use your credential cache by creating a jaas.conf file with the following contents:

  Client {
   com.sun.security.auth.module.Krb5LoginModule required
   useKeyTab=false
   useTicketCache=true
   principal="<user>@EXAMPLE.COM";
   };

  Replace <user> with your username, and EXAMPLE.COM with your Kerberos realm.
• If you want the client application to authenticate using a keytab, modify jaas-client.conf as follows:

  Client {
   com.sun.security.auth.module.Krb5LoginModule required
   useKeyTab=true
   keyTab="/path/to/user.keytab"
   storeKey=true
   useTicketCache=false
   principal="<user>@EXAMPLE.COM";
  };

  Replace /path/to/user.keytab with the keytab file you want to use and <user>@EXAMPLE.COM with the principal in the keytab. If you are using a service principal that includes the hostname, make sure that it is included in the jaas.conf file (for example, solr/solr01.example.com@EXAMPLE.COM).

Using the JAAS configuration file:

• Command line
  Set the property when invoking the program. For example, if you were using a jar, you might use:

  java -Djava.security.auth.login.config=/home/user/jaas.conf -jar app.jar

• Java applications
  Set the Java system property java.security.auth.login.config. For example, if the JAAS configuration file is located on the filesystem as /home/user/jaas-client.conf. The Java system property java.security.auth.login.config must be set to point to this file. Setting a Java system property can be done programmatically, for example using a call such as:

  System.setProperty("java.security.auth.login.config", "/home/user/jaas.conf");

• MapReduceIndexerTool
  The MapReduceIndexerTool uses SolrJ to pass the JAAS configuration file. Using the MapReduceIndexerTool in a secure environment requires the use of the HADOOP_OPTS variable to specify the JAAS configuration file. For example, you might issue a command such as the following:

  HADOOP_OPTS="-Djava.security.auth.login.config=/home/user/jaas.conf" \
  hadoop jar MapReduceIndexerTool

• hbase-indexer command

  Certain hbase-indexer CLI commands such as replication-status attempt to read ZooKeeper hosts owned by HBase. To successfully use these commands in Solr in a secure environment, specify a JAAS configuration file with the HBase principal in the HBASE_INDEXER_OPTS environment variable. For example, you might issue a command such as the following:

  HBASE_INDEXER_OPTS="-Djava.security.auth.login.config=/home/user/hbase-jaas.conf" \
  hbase-indexer replication-status

Repeat this process on all Flume hosts:

1. If you have not created a keytab file, do so now at /etc/flume-ng/conf/flume.keytab. This file should contain the service principal flume/<fully.qualified.domain.name>@<YOUR-REALM>. See Flume Authentication for more information.
2. Create a JAAS configuration file for flume at /etc/flume-ng/conf/jaas-client.conf. The file should appear as follows:

   Client {
    com.sun.security.auth.module.Krb5LoginModule required
    useKeyTab=true
    useTicketCache=false
    keyTab="/etc/flume-ng/conf/flume.keytab"
    principal="flume/<fully.qualified.domain.name>@<YOUR-REALM>";
   };

3. Add the flume JAAS configuration to the JAVA_OPTS in /etc/flume-ng/conf/flume-env.sh. For example, you might change:

   JAVA_OPTS="-Xmx500m"

   to:

   JAVA_OPTS="-Xmx500m -Djava.security.auth.login.config=/etc/flume-ng/conf/jaas-client.conf"